Locomotive-boiler



(No Model.) 2 Sheets-Sheet 1. G. S. STRONG.

LOGOMOTIVE BOILER. No. 266,551. Patented 001;. 24, 1882.

IMLUI H WTIVES 51 INI/ENTORI- (No Model.) 2 Sheets-Sheet 2.

G. S. STRONG.

LOCOMOTIVB BOILBR.

Patented Oct. 24, 1882.

00000000f00, D.000000000 i WTNESSES? NVENTORI @Y /wf@ WW @ZJ j? UNITED STATES PATENT OFFICE.

GEORGE S. STRONG, OF PHILADELPHIA, PENNSYLVANIA.

LOCOMOTIVE-BOILER.

SPECIFICATION forming part of Letters Patent No. 266,551, dated October 24, 1882.

Application filed August 28, 1882. (No model.)

To all whom it may concern:

Be it known that 1, GEORGE S. STRONG, a citizen of the United States, and a resident of Philadelphia, Pennsylvania, have invented certain Improvements in LocomotiveBoilers, of which the following is a specification.

The object ot' my invention is to make a locomotive boiler with laterally extended grate-surface without resorting to the usual heavy and costly crown-bars and stays; and this object I attain in the manner which I will now proceed to describe, reference being` had to the accompanying drawings, in which- Figure 1, Sheet l, is a longitudinal vertical section of my improved locomotive-boiler; Fig. 2, a sectional plan; Fig. 3, Sheet 2, a transverse section on the line l2; and Fig. et, a transverse section on the line 3 4. l

Very wide tire-boxes have been recently adopted to a limited extent in the construc-v tion of locomotives, with the view of obtaining increased heating-surface and a more extended grate area; but the wide tire-boxes as heretofore constructed demanded massive and costly crown-bars and a complex system of stays. I obviate the necessity of these costly appliances by combining` two cylindrical tire-boxes, A A', placed side by side, with the usual cylindrical shell or barrel,B, in the inanner which I will now proceed to describe.

Each of the tire-boxes consists of an outer cylindrical shell, a., and an inner cylindrical casing, b, the two shells being flattened at; a', Fig. 3, where they meet each other, and where they are secured together by nuts or bolts, angle-irons y y being used as further means ot' attachment. The outer cylindrical shells of the two tire-boxes terminate in front at yn, whence they merge into the cylindrical barrel B. A chamber, D, is formed by plates h, f, and t' at or near the junction of the outer shells ot' the tirc-box with the barrel of the boiler,the chamber being otI the conformation best observed in Fig. 4, and the platef of the chamber being the rear tube-sheet for the system of tubes E, the front ends of which terminate at the smoke-box in the usual manner. The chamber D is large enough to admit an operative and permit him to properly secure the tubes to the tube-shcetf. There is a direct communication between the end ot' each inner casing b of the re-box and the chamber D through a tubular connection, j, two connections serving as mediums for securing the ends of the inner casings of the fire-boxes to the rear plate. c', of the chamber D.

lt is not essential to the main feature of my invention that there should be a direct communication between the two tire-boxes5 but I prefer the connections to between the two inner casings of the fire-box, so that if valves be applied to the connections j j the gases generated on the admission ot' a fresh supply ot' fuel into one chamber may be caused to pass into the other chamber and over the bed of incandescent fuel therein, so as to be ignited and consumed. I also prefer to corrugate the inner casings of thetirebox, as shown, in order to add to their strength.

H are the grate-bars, which preferably consist of tubes communicating with the waterspaces, and below the grate-bars are inclined shelvesp p for directing the ashes to the opening q, through which air is admitted for supporting combustion.

There is the usual feed-opening, t, foreach tirechamber, and tire-doors similar to those of ordinary locomotive-boilers are furnished for each opening.

As both the inner and outer easings of both tire-boxes are cylindrical, it will be seen that the desired extended grate-surt'aceis obtained without the objectionable crown-bars and array of stays which are. such objectionable features in the modern wide tire-boxes which have been recently applied to locomotiveboilers.

I claim as my invention- 1. The combination, in a locomotive boiler, of two tire-boxes placed side by side, and each consisting of a cylindrical outer casing and a cylindrical inner casing, lwith the barrel into Which the outer c isings of the tire-boxes merge, substantially as set forth.

2. The combination of the two cylindrical tire-boxes placed side by side, and the tubed barrel B, into which the outer shells ofthe tireboXes merge, with the chamber D, communieating with two tire-chambers ot the tire-boxes and with the tubes of the barrel,substantially as set forth.

In testimony whereofI have signed my name to this specitication in the presence of two subscribing witnesses.

GEO. S. STRONG. Witnesses:

HARRY DRURY, HARRY SMITH. 

